Remove intermediary writing

I had added functionality to write the output as the crawl goes but that turned
out to cause a problem in some situations, so I removed it.

Also moving forward with using pyproject.toml instead of setup.py.

Fixes #29

Include year and incremental output

This commmit adds the year (when available) to the title that gets
displayed in the HTML view.

It was easier to just have étudier generate the output as it goes
instead of waiting for a captcha. The program is really iobound by
talking to Google Scholar, so I don't think there's much of a
performance impact.

closes #24
closes #7

pin dependencies a bit

refs #28

small doc fixes for release

new version

center the visualization horizontally

new version

This adds the pypuppeteer dependency that didn't seem to be required
before. It also catches a situation where the id of a citation cannot be
determined.

new version

new version

new version